Topic
Sessile drop technique
About: Sessile drop technique is a research topic. Over the lifetime, 2827 publications have been published within this topic receiving 68943 citations.
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TL;DR: In this article, a simple and precise method for measurement of contact angles in the range 0° − 180° on solid surfaces is proposed, based on a numerical solution of the Laplace equation for the interfacial profile.
55 citations
TL;DR: In this article, a Fourier transform infrared spectrometer (FTIR) was used to measure the spectral absorbance along a set of paths passing through the vapor cloud and a two-dimensional spatial concentration distribution was determined using a computed tomography routine.
55 citations
TL;DR: In this paper, a new model was developed to represent the time dependence of the contact angle, i.e., the spreading behavior of a liquid drop on a solid substrate, taking into account chemical interactions which continually take place at the interface between the solid Al 2 O 3 and molten CaO-Al 2 O3 -SiO 2.
Abstract: The wetting behavior of solid Al 2 O 3 with molten CaO-Al 2 O 3 -SiO 2 was investigated at 1 873 K using the sessile drop method. A new model was developed to represent the time dependence of the contact angle, i.e., the spreading behavior of a liquid drop on a solid substrate. The model takes into consideration chemical interactions which continually take place at the interface between the solid Al 2 O 3 and molten CaO-Al 2 O 3 -SiO 2 . By applying the model to the experimental results of the present study the equilibrium contact angle between the liquid slag and solid alumina was determined for a number of different slag compositions, and an iso-contact angle diagram was constructed. The equilibrium contact angle was greatly affected by the slag composition, and it was found that the interfacial tension was the major factor governing the equilibrium contact angle. In the region of low SiO 2 content, the slag with higher CaO content exhibits a smaller contact angle, i.e., better wettability with alumina. For slag with a given CaO/SiO 2 ratio, an increase in Al 2 O 3 results in a corresponding increase in the contact angle, i.e., decrease in wettability. For a given CaO/Al 2 O 3 ratio, the variation of the contact angle with SiO 2 content shows a minimum. The contact angle decreases by increasing the surface roughness of the alumina substrate.
55 citations
TL;DR: In this article, the wetting behavior of a new Sn-Bi-Cu Pb-firee solder on Cu substrate was investigated by sessile drop method under an Ar-H(2) flow in the temperature range from 493 K to 623 K.
55 citations
TL;DR: Comparison with the published calculations performed using lubrication approximation (very thin drop) suggests that qualitative picture of the capillary flow is insensitive to the ratio of initial drop height to the drop radius.
Abstract: An analytical expression of hydrodynamic potential inside an evaporating sessile drop with pinned contact line is found. The problem is considered for a hemispherical drop (with the contact angle of 90\ifmmode^\circ\else\textdegree\fi{}) at the very early stages of the evaporation process when the shape of the drop is still a hemisphere and the evaporation field is uniform. The capillary flow carries a fluid from the drop apex to the contact line. Comparison with the published calculations performed using lubrication approximation (very thin drop) suggests that qualitative picture of the capillary flow is insensitive to the ratio of initial drop height to the drop radius.
55 citations